Voice-current telephone repeater



Feb. 13, 1923.

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UNI-TED STATES I ARTHUR BSSEY SMITH, -OF EVANSTON, ILLINOIS,yASSIGrINIOR TO A'TOMATIC ELECTRIC COMPANY, OF CHICAGO, ILLINOVOICE-CURRENT TnLrHoNE RErEATER.

Is, A CoRPoRA'iIoNor ILLINOIS.

v,Appiieaiion,flied Maren'5, 1919, seriei No. 280,695. Renewed June #12,1922. serial Ne. 567,744..

To all whom zt ma concern.'

Be it known that I, RTHUR BESSE-.r VSMiTH, a citizen of the UnitedStates of America, and a resident of Evanston, in the county of Cook andState of Illinois, have invented. certain new and useful Improvementsin.

Voice-Current Telephone Repeaters,

`of which the following is a specilication.

My invention relates in general to a Voice current repeater for use ina' telephone system and relates more specifically vto an im provedmethod of switching a voice current amplier from connection in al trunk`line to repeat in one ldirection to connections which adapt'it torepeat voice currents-in the opposite direction.- .7 y

\The object of my :invention is fto proyide a simple and eiicient deviceof" this character in which the repeater is left connected forrepeat-ingv .in the-directionl in which it was last used; that is,a'person may continue talking from one end of a trunk lineas 'long I asmay be desired, and will switch'the repeater once at the beginning. ofhis conversation, if itwas previously used in the opposite direction,and will not havev to performy anymore switching .operations until afterthe -party at the opposite end has spoken to -reverse the repeater. Inthis way only the `first part of the first word spoken is used to do thework ot reversing and should there be a Ipause in the conversation hemay continue after the pause without having t'o again rverse thAconnection. A

I will point out the features and objects of my invention more in detailby'referringl to the accompanying drawing, in WhichI have shown only aportion of a trunk'liiie, one end of which Iwill call thevwest end andthe other the east end. It will be under-l stood that this trunk linemay be connected up Ifor userin an desired type of automatic or manualsystem. ,l Interposed in 'the' center of this trunk line I have shown alvoice current repeater consisting Of-a device, shown as a .receiver 2for simplicity, for receivingl voice cur'- rents and for repeating thesaine into' a transmitter 3 in with an induction coil primary 4.- which'induces corresponding It is to be understood that this transmitter andreceiver arrangement may benany known type of voice current amplier. Therelay 6 is provided for switching either the receiver or rents will beampJlified and repeated from they east end to the' west end.

Assuming that the last party to send voice current over the line was theone at the west end, then the device will be left in the position shown.Now, if the party at thewest end starts .to talk agaimvoice current willtravel from. the conductor. `14:, through springs 15 and 16', receiver2, springs17 and 18, and back over conductor 19, thus agitat- ,ingnthejreceiver 2 and causing the transmitter 3 to in turn be' agitated toinduceian l .amplified voice'current in winding of the induction coil.This induced current will follow a path 'as follows :n from conductor20,

`throughsprings 21 .and '22, winding 5 andv sensitive relay 7 inmultiple, sensitive relay 8, `springsH 23 and124, and back over4conductor 25 -tothe instrument of the party on the"`east end;` Therelays 7, 8 and 9 are all ola sensitive type of relay which respond to'alternating current in such .a manner that their weighted armatures'ly.oii' to keep the contact between |the two springs open for a largerpart of the time.v These relays may be of the type shown in U. S.Letters Patent No.V 1,221,299, granted April e, 1911i@ Jehnf Erickson.Now it will be seen that relays 7 and J8 are .included'in the circuit ofthel amplified voicelcurrent so .that both of said relays will beenergized during conversation from thewest end. The relays" 10 and 11are differential -rela s. Relay 12 is slightly slow in operation. i ow,when relays 7 and 8 are energized as described thenrboth winding ofrelaysl 10v and 11 will be opener closed simultaneously at springs' 26',thus .prevent- ,ing any movement of saiob relays.' Relay 12 'remainsenergized during this time from ground through yback contacts of relays-6 and 11. West end cease conversation and the subscriber at the veastend commence to talk, then the relay 8 alone will energize in the east jbranch circuit, as in this case weak talking currentonly is flowingthrough the la'st traced circuit of the east 'end of the trunk. Thesensitive relay4 7 is in series with a resistaiice 27 and is adjusted sothat it will not Now should the subscriber at the energize with weakcurrent buton-ly with amplifiedcurreht. .Now'when.relay 8 op eratesitwill be Seen` that the circuit of the upper winding of relays 10 and 11is opened y and said y relays immediately energize through -their'ilowerwindings. The ircuit vof the`lo`wer windings extends from batterythrough saidwindi'ngs, springs' 287 springs 5 29 and 0, springs 26,springs 31. and 32, and springs: 3 and 34130 ground. Relay 10 pulls4 upand immediately closes the circuit of switching relay 6 at springs 35.Relay 6 starts to pull u its armaturesto switch /t-he connectionsto' eam lil-ier and also switches 15, the. ground connection from spring 33gto spring'S. The springs 34 and 33 stay in contact until springs 34 and36 close. Relay 11 pulls up: before relay 6A completes its vj stroke sothat the 'circuit ofrelay 12 is held 29 closed through springs 37 and38. As `soon relay'.6' completes its strokezand opens springs 33 34:,then the circuit for the i lower winding of relays' 10' and 11 isbroken. The circuit of relays 10 and 11 was broken at springsf30 and S9-when relay 11 was energized; vbut la new.. locking circuit was closed atspringslO-.whiohois the circuit that is now broken at springs 33 and 34.lRelay 10 is a diiferentially wound polarized relay and the armature islarrangedto stay where it is put; that is, if the lowerywinding alone isenergized the' armatdre closes springs 35 which stay closed as long asboth windings are energized together or as long.A as the lower winding-alone isgenergized. b ut opens thei springs`3-5 iff'the upper windingalone is en'- ergized. This type of relay is well known in telegraphworkand may have two sepa- .frate coilsifdesired. NOW when the V'circuit 4oof the twof ;low er windings are opened springs-3 5 stayiclosed butrelay llfalls loa/ck.' lher circuit ofvrela 1 2 is now opened atsprings37` and 38,"tiie springs 29, 30 and 39 close again render Itherelays 10 and 11 againgsubject tothe control of relays 7 and 9 andsprings open.

ow as soon fas relay energiz'es, a new 4'path isxelose'd for the voicecurrents from the east end of the trunk extending' from con-r 59'ductor- 20, springs 2l and 41, receiver 2,'

springs 42 and-.24, andconductor 2 The amplified current now Hows throu.from conductor 14, springs 15 andiS, secondary ,5 "and relay Zinmultiple, relay 9,' and springs 44' and 1 8 to conductor 19. Relays '7 vand 9 energize at this time simultaneously relay 7 rendering rel'ay 9inedective 'to produce any change in the circuits of relays 1() and11,by

openmg both-sides of said coils." n O9- Now should the veast.partyscease .and the fwest again start then the operationsare gsomewhatsimilar, the switching being done l by relay 9. in this case, whilerelay 7- isquiet. Relay 9o ens the circuitof the lower wind- @5 ings ofre ays 10 and 1 1 at springs TheA fstartfthe switching andfthatimmediately 'the relay 1? becomes e'ective to respond to repeating fromthe other end thereof, a conlaaaeos I .relay110 'operates to opent;v thevsprings 35 in the circuit of relay 6. The deenergization of the relay 6causes relay 12 to be energized as soon as relay 11 is deenergized, thelatter operation following as 'a result of the opening of the circuitfor both ofits. windings at springs 34 and 36 lyrelay 6.1L

' lt will th s be'seen that as longas relay 7 is operating, neither ofthe relays 8 or 9' can be eective to Switch the amplifier but if. eitherrelay 8 or\9 is operated alone then the amplifier is switched over andthe circuit so changed that relay 7 prevents any l further change andthat the' other bsensitive relay is `prepared to do the next switchingover. llt will be understood that only the first wave of weak talkingcurrent 1s used to amplified currentsr to holdthe device sta?"V tionary.

Having described the features and aspects of myinvention what llconsider to be new and desire to have protected by Letters atent will bepointed out -in the appended claims.

What ll claim asmy invention is: 1

1. llna telephone system, a line, an ampli er associated with -said linefor repeating voice currents from either endthereof to the other, saidrepeater always normally connected'to amplify and `repeat inrnedirection a switching device for changing the connections of said'amplifier to adapt it for trolling device for each endof said trunk lline-for operating said switching device, and another controlling devicefor rendering both of said first 'controlling devicesineffective.' 1-

' 2. lin a telephone' system, a line, an ampli-l fier associated with"theglinerfa'relay for re.- versing the connection of said amplifier withthe line for repeating voice currents in either direction thereover,means for controlling saidrelay consistingof a device for each. end ofthe trunk line and each 'controllable overits respe'ctiveend toeither-*energize or deenery mid rela' and another device' controableover-feit er -end of the line to prevent the control of said relay byeither of said devices.

1 3. lin a telephone system, a line, an ampli- Ahier normy connected tofthe line for repeatmoice currents fromone end to the other v w meansfor reve said ampliierto repeat in the opposite direction, a

sensitive device for each end of the line@ 125.- controlling said means,vone of said devices responsive to voice currents thereover fornormallyinoperative, means for rendering. the other device ineectivewhen vorcecurrents are sent from. one end. of' the line and mecontrolled thereby for operating mid it@ ilo- 1,444,805' i y l .firstmeans to reversethe amplifier when4 currents are' sentv from the otherend of the' trunk line and to render the other device operative. j

4. lIn'a telephone system, a line, an amplifier normally connected tothe line` for repeating voice currents from one end to theother'thereof, means for reversingsaid amplifier to repeat in theopposite direction, a sensitive device for each end of the lineresponsive to voice currents "thereover for controlling said means oneofsaid devices normally inoperative, means for rendering the other deviceineffective when voice currents are sent from' one endI of the lineandmeans controlled thereby lfor operating said first means to 'reverse theamplifier when currents are sent from the other end of the trunk lineand to render the othery device operative, and/means controlledfrom'both ends of the line for rendering all of Said devicesineffective.

l5'. In a telephone system, apair of lines joined by voice `currentrepeater, saidv repeater always normally connected to amplify andrepeat'from one line vto the other, a sensitive relay in each line'loperated by voice 'currents' passing over' its associated line to switchthe repeater to repeat from-'its line to the other and another sensitiverelay controlled by the amplified voice currents to render both of saidfirst sensitive relays inoperated from either -line to yprevent any Vchange inthe energization or deenergization peater always normallyconnected to amplify joined by a'voice current repeater, said re-l andrepeat from one l'rneto the other, asensitive relay for eachlinepperated .by voice currents, a polarized relay in Lsaid repeater,

one of said sensitiverelays adapted to energlze said polarized relay andmeans responsive upon the energiz'ation of said polarized relay forswitching the `said repeater to amplify and repeat in the `oppositedirection, another sensitive 'relay in said repeater adapted toy be,controlled from" either line,v

and means responsive to''the energization of sald relay for render-lngeltherone or the other of said first mentioned sensitive rplaysinoperative depending upon which'direction' As/aid repeater is repeatingvoice currents, 10. In a telephone systema pair of lines off firstmentioned relay fjrom said line and.

to render the other of said relays ineffective.

7. In a telephone system, a pair of lines,

joined by a voice current repeater', a relay for switching theconnections -of said4 repeater to said lines to repeat voice currentsV'from either line, a sensitive relayl for-one line forcontrollingi'said switching relay in one manner and a sensitive relaylfor the other line for controlling the said first relay in anothermanner, and'another sensitive relay operated from either line forrendering both of'said other sensitive, relays ineffective.-

8'.; In a telephone system, a"pair of lines joined by a voice currentrepeater ,normally connected torepeat voice, currents `from one line tothe other, a switching relay adaptedto either remain energized or;deenergized to connect the repeater` for repeating from either line, acontrolling device -for one line for energizing said relay and' acontrolling device for the other line' for c leenergizingA i vsaidrelay, and@ common lcontrolling device the second winding, of eachcontrplling rejoined by a voice current repeater always normallyconnected to amplify and repeat in one direction, a sensitive relayassociated with each line and controlled by voice'currents thereover,ajmlai'izd relay in said' repeater, one o f'said sensitive relaysadapted to energize said polarized relay, means responsive upon theene-rgizationy of said polarized relay for switchingthe repeater torepeat andI amplify4 in the opposite direction and for rendering thesaid last mentioned sensitive relay inoperativelto voice currents 4fromits associated line. i

1 In atelephone-system, a pair of lines joined to a voice current:repeater alwavs normally connected to repeat and `amplify in cnadirection, a relay vadapted, to-switch the connection of said'ArepeaterA to repeat and amplify iff the opposite direction, a pair ofdouble wundrelays for controlling thefoperation-of said relay, anormally closed circuit for'both windingsof each of said con-- trollingrelays, a sensitive relay for opening.

the circuit o'ffone winding of each cont'rol-` 1 'ling relay to operatesaid switching relay,

and-a second sensitive relay adapted toopen the second winding o f each.controlling relay to deenergize said switchingl relay. v v

l2.4 In a telephone system, a pair of lines l .joined lto a voicecurrent repeater always normally connected torepeatand amplify in onedirection, ya`re'lay` adapted `to switch the connection of said repeaterto repeat and amplify in the opposite direction, a pairgof doublewoundrelays for controlling -the operation of said relay, a normally closedcir; j

cuit forboth windings of each yof said controlling relays, a sensitiverelay for openingthe circuit off onewinding'of -each co` nt101" lingrelay to operate said .switching relay,

and a 'second-sensitive relay adaptedto open double wound relays forcontrolling the op? eration of said relay, a normally closed circuit forboth windings of each of said controlling relays, a sensitive relay foropening the circuit of one winding of each controlling relay to operatesaid switching relay,

and 'a second sensitive relay adapted to open the second winding of eachcontrolling relay to deenergize said. switching relay, and the circuitof both windings of each of said controlling relays' adapted to beopened and closed by the operation of said switching relay. Y

llt. In a telephonesystem, a pair of lines joined to a voice currentrepeateralways normally connected to repeat and amplify in onedirection, a relay 'adapted to Switch the connection of said' repeaterto repeat and amplify in the opposite direction, a pair of double'wound-relays for controlling the operation of said relay, a normallyclosed circuit for both windings of each of said controlling relays, asensitive relay for opening the circuit of one winding ofA eachlcontrolling relay to operate -said switching relay, and a secondsensitive relay adapted to' open the second winding of eachcontrollingrelay to deenergize said switching relay, and a normally energizedrelay1for controlling the circuit of one winding of eacli'of saidcontrolling relays. 15. In a'telephonegsystem, a pair'of lines joined:by a voice current repeater, said re`V` peater always normallyconnected'to repeat and amplifyl from one line to ,the'othen a switchingrelay for changing the 'circuits of said repeater to amplify and repeatin the opposite direction, a di'erentialIrelay for controlling saidswitching" relay, av sensitive device responsive to voice currents fromJferential relay device. Y

' either of said lines, and circuitsfor said dif-A lcontrolled bysensitive 16. In a telephone system, apair of-lines i joined by a voicecurrent repeater, Asaid repeater always normally connected to Nrepeatand yamplify from,one line tathe other, a switching relay for reversingsaidi'epeate 5 torepeat and amplify inthe opposite dire tion, adi'erential relayfor controlling said switching relay, asensitive'device for each line responsive tovoice currents-thereove,

and a circuit .for each-winding of'said .dif-' ferential relay, eachcircuit including normally closed contacts on eachof 'said' sensitivedevices.

17. ln' a telephone system, a pair of lines joined by' a voice currentrepeater, said re and amplify from one lineto the other, a

' peater always normally connected .to repeat switching relay forreversing said repeater c to repeat and amplify in the opposite direc'-tion, a differential relay for controlling said sw1tch1ngv relay, a.sensitive devlce for. each l1ne responslve to `vo1ce currents thereover,a`

circuit for each Vwinding of said ,differential relay, each circuitincludingnorr'nally closed Y contacts oneach of said sensitive'devices,and

a third sensitive dev-ice y responsivejtovvoice currents from eithervline to render the 6peration of the first mentioned sensitive-,de-

vices ineffective to control said dierential relay. .S o- 1 Signed atChicago, Cook County, Illinois, this 27th da of February 1919. 5' 1 arenin Bnssnr stain.'-

